How about this: the aircraft was capable of an OGE hover per the POH at approx. 4800 ft pressure altitude under the stated conditions, but it was landing at an altitude of 350 MSL. In my book that is "well within", others may have a different opinion.
But you don't know how far within and what level of power margin it gives you - that is my point. Just having OGE performance isn't enough for confined area work. And his DA was about 1200'.
If you were doing a long transit like that in uncertain weather conditions, wouldn't you fill it to full (if you could keep within max gross). The report doesn't mention previous refuel stops but they had to go beyond where they originally planned to refuel so the chances of it being quite empty are higher and may explain why he chose to try and get in where he did.
It would be interesting to know if he did any pre-flight performance planning.
Poor airmanship, poor decision making and ultimately poor handling are the causes here - an inexperienced pilot biting off more than he can chew.